Critical Period of Weed Control in Sugar Beet in Shahrekord Region

Weed competition is one of the yield-limiting factors of sugar beet production in iran. weed competition may reduce the root and sugar yield, depending on the weed density and the intensity of weed competition with the crop. in order to determine the critical period of weed control (cpwc) in sugar beet in shahrekord region, an experiment was arranged in a randomized complete block design with 14 treatments and four replications in 1999 and 2000. treatments included weed-free plots until 2, 4, 6, 8, 10 and 12 weeks after planting (wap) in 2000 (in 1999 based on the stages of crop growth in the form of weed control, treatments were until 4, 6, 8, 10, 12 and 14 - leaf stages of sugar beet) and weed-infested plots from 2, 4, 6, 8, 10 and 12 weeks after planting sugar beet in 2000 (in 1999 based on the stages of crop growth in the form of weed interference until 4, 6, 8, 10, 12 and 14 - leaf stages of sugar beet). two control treatments (full-season control of weeds and full-season interference of weeds) were also included. the results showed that weed infestation significantly (p